M1009 Door Glass Run seals...2 types?

[linx310]

I was looking to order a new set of glass run seals for my M1009.

The part catalogs show that it is a one piece setup, but my truck seems to use a 2 piece setup.

Should I just order the 1 piece setup for the 81-91 BLAZER listed by LMC?

I found a post from the past on here some one also noticed the same thing.

http://www.steelsoldiers.com/cucv/14671-anyone-replaced-their-window-glass-seals.html

I included a pic of the part circled in red. Part 13

 

[ranchhopper]

The older 73-80 took a thinner seal the windows are quite a bit thinner on the 81-87 trucks so you need the thicker seals.